Hinged covers for rectangular receptacles



A ril 2, 1963 w. VAN DER WERFF 3,083,860

' I HINGED COVERS FOR RECTANGULAR RECEPTACLES Filed Oct. 25; 1960 2 Sheets-She et 1 f I I l w- I r 4 5- v 12 v11 14 11 P 1242f I km I HI -FIG.1

. INVENTOR WILLEM VAN DER 'WERFF April 2, 1963 w. VAN DER WERFF 3,083,360

HINGED COVERS FOR RECTANGULAR RECEPTACLES 2 Sheets-Sheet 2 Filed Oct. 25. 1960 F'IG.4

INVENTOR WI'LLEM VAN DER WERFF Apuzs United States Patent 3,083,860 HlNGED COVERS FDR RECTANGULAR RECEPTACLES Willem van der Werir', Haarlem, Netherlands, assignor to Werltspoor N.V., Amsterdam, Netherlands, a company of the Netherlands Filed Get. 25, 196i), Ser. No. 64,817 Claims priority, application Netherlands Nov. 3, 1959 2 Claims. (Cl. 22032) The invention relates to a hinged cover for a rectangular receptacle, said cover being pivoted about an axis supported at the wall of the receptacle and having a clearance in the lugs of the cover, enabling the cover to be displaced parallel to the sealing face of the receptacle for releasing the cover when opening it.

With receptacles which are subjected to high internal pressure it is required to press the cover properly on the receptacle and in order to rapidly open and close such a cover closing means without using bolts has "been proposed, which however, are rather complicated.

The invention has for its object to obtain boltless closing means for a cover of the kind referred to which are of simple construction and easy to operate.

According to the invention the cover at opposite sides is provided with a longitudinal groove, one of said grooves being open towards the outer side of the cover and the other groove being open towards the inner side of the cover, the cover with said grooves being adapted to engage edges at the sealing face of the receptacle, at least one hell crank lever being secured to the pivot axis of the cover, said lever engages the cover with one of its arms and carries at its other arm a counterweight operating only in the direction for opening the cover and a removable support being provided adapted to prevent rotation of the pivot axis under the influence of the counterweight.

In the accompanying drawing, in which an embodiment of the cover according to the invention is illustrated, FIG. 1 shows a plan view of the cover.

FIGS. 2 and 3 each show a cross sectional view taken on line IIII and line IlIIII of FIG. 1 respectively in which also a portion of the receptacle to be closed is shown.

FIG. 4 is a similar view as FIG. 3 but with the cover in released position.

The cover 1 has grooves 2 and 3 at its opposite longitudinal sides and of which the groove 2 is open at the outer side of the cover and the groove 3 is open at the inner side of the cover. The cover with said grooves 2 and 3 may engage edges 5 and 6 at the upper face of the receptacle 4.

The cover 1 with its lugs 7 is pivotable about an axis 8 rotatably supported at the wall of the receptacle and the apertures 9 in said lugs are oblong so that the cover has clearance on the pivot axis 8 and therefore, can slide with respect to the axis in order to be released from the edges 5 and 6 of the receptacle as shown in FIG. 4.

Two counterweights 10 are suspended on the pivot axis 8 through the intermediary of a lever 11 and a bell cr ever 1% c red t e S aft and havi g its a i atented Apr. 2, 1963 ice right arm 13 engaging the lug 7 of the cover. It the bell crank lever 12 is rotated from the position shown in MG. 3 to the position shown in FIG. 4 the cover slides with its lugs 7 on the pivot axis 8, so that the cover is disengaged from the edges 5 and 6 at the sealing face of the receptacle.

For relieving the cover from the load of the counterweights an arm 14 is secured on the axis 3 and said arm can be supported on a sleeve 15 provided with inner screw thread and united with a handwheel 16. Said sleeve 15 is threaded on a rod 17 engaging the wall of the receptacle at 18. For opening the cover the support 15, 17 of the arm 14 is withdrawn by rotating said support away from the arm towards its dotted line position in FIG. 2, so that now the weights 16 are set to operate on the cover and displace and rotate the cover towards its open position.

What I claim is:

1. In combination a receptacle having an opening surrounded by a rectangular frame having a planar sealing face and a hinged cover for sealing the face of said opening, said cover being pivotable about an axle supported by the receptacle, lugs on said cover having openings through which said axle extends with clearance enabling the cover to be displaced parallel to the sealing face of the receptacle opening, at least one pair of interfitting longitudinal grooves and ribs substantially parallel to said sealing face of the receptacle opening -for locking the cover in sealing relation to the receptacle, the groove of one pair being formed in one of said cover and receptacle and the rib in the other, a bell crank lever secured to said axle, one arm of said lever engaging the cover and the other arm carrying a counterweight, a movable support pivoted on the receptacle to engage an arm fixed to said axle for taking up the load of the counterweight when the cover is in closed, sealing position on the receptacle and thereby preventing movement of the cover from closed position, said bell crank lever and counterweight being so disposed as to first move the cover parallel to the sealing face of the receptacle opening to disengage said rib from the associated groove and then continue the cover opening movement by swinging the cover in a receptacle opening direction when said movable support is turned to disengage the said arm of the axle and release the counterweight.

2. The combination according to claim 1 wherein two pairs of longitudinal grooves and ribs are provided in said cover and receptacle, said grooves being positioned at opposite sides of the periphery of the cover, and one of said longitudinal grooves opening outwardly and the other groove opening inwardly of the cover.

References Cited in the file of this patent UNITED STATES PATENTS 

1. IN COMBINATION A RECEPTACLE HAVING AN OPENING SURROUNDED BY A RECTANGULAR FRAME HAVING A PLANAR SEALING FACE AND A HINGED COVER FOR SEALING THE FACE OF SAID OPENING, SAID COVER BEING PIVOTABLE ABOUT AN AXLE SUPPORTED BY THE RECEPTACLE, LUGS ON SAID COVER HAVING OPENINGS THROUGH WHICH SAID AXLE EXTENDS WITH CLEARANCE ENABLING THE COVER TO BE DISPLACED PARALLEL TO THE SEALING FACE OF THE RECEPTACLE OPENING, AT LEAST ONE PAIR OF INTERFITTING LONGITUDINAL GROOVES AND RIBS SUBSTANTIALLY PARALLEL TO SAID SEALING FACE OF THE RECEPTACLE OPENING FOR LOCKING THE COVER IN SEALING RELATION TO THE RECEPTACLE THE GROOVE OF ONE PAIR BEING FORMED IN ONE OF SAID COVER AND RECEPTACLE AND THE RIB IN THE OTHER, A BELL CRANK LEVER SECURED TO SAID AXLE, ONE ARM OF SAID LEVER ENGAGING THE COVER AND THE OTHER ARM CARRYING A COUNTERWEIGHT, A MOVABLE SUPPORT PIVOTED ON THE RECEPTACLE TO ENGAGE AN ARM FIXED TO SAID AXLE FOR TAKING UP THE LOAD OF THE COUNTERWEIGHT WHEN THE COVER IS IN CLOSED, SEALING POSITION ON THE RECEPTACLE AND THEREBY PREVENTING MOVEMENT OF THE COVER FROM CLOSED POSITION, SAID BELL CRANK LEVER AND COUNTERWEIGHT BEING SO DISPOSED AS TO FIRST MOVE THE COVER PARALLEL TO THE SEALING FACE OF THE RECEPTACLE OPENING TO DISENGAGE SAID RIB FROM THE ASSOCIATED GROOVE AND THEN CONTINUE THE COVER OPENING MOVEMENT BY SWINGING THE COVER IN A RECEPTACLE OPENING DIRECTION WHEN SAID MOVABLE SUPPORT IS TURNED TO DISENGAGE THE SAID ARM OF THE AXLE AND RELEASE THE COUNTERWEIGHT. 